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Used to enlarge the opening of a hole. Typically used to allow for a screw to sit flush with or below the level of a workpiece's surface.

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Counterbore Set, 3 Flute HSS, Set of 7
5193 Counterbore Set, 3 Flute HSS, Set of 7    
$69.95  
Counterbore Set, Interchangeable Pilot, HSS, 21 Piece
5389 Counterbore Set, Interchangeable Pilot, HSS, 21 Piece    
$96.95